1/*
2 * Copyright 2014 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#include "gm.h"
9#include "SkCanvas.h"
10#include "SkColorMatrixFilter.h"
11#include "SkGradientShader.h"
12
13static sk_sp<SkShader> make_shader(const SkRect& bounds) {
14    const SkPoint pts[] = {
15        { bounds.left(), bounds.top() },
16        { bounds.right(), bounds.bottom() },
17    };
18    const SkColor colors[] = {
19        SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorBLACK,
20        SK_ColorCYAN, SK_ColorMAGENTA, SK_ColorYELLOW,
21    };
22    return SkGradientShader::MakeLinear(pts, colors, nullptr, SK_ARRAY_COUNT(colors),
23                                        SkShader::kClamp_TileMode);
24}
25
26typedef void (*InstallPaint)(SkPaint*, uint32_t, uint32_t);
27
28static void install_nothing(SkPaint* paint, uint32_t, uint32_t) {
29    paint->setColorFilter(nullptr);
30}
31
32static void install_lighting(SkPaint* paint, uint32_t mul, uint32_t add) {
33    paint->setColorFilter(SkColorMatrixFilter::MakeLightingFilter(mul, add));
34}
35
36class ColorFiltersGM : public skiagm::GM {
37public:
38    ColorFiltersGM() {
39        fName.set("lightingcolorfilter");
40    }
41
42protected:
43    virtual SkString onShortName() override {
44        return fName;
45    }
46
47    virtual SkISize onISize() override {
48        return SkISize::Make(620, 430);
49    }
50
51    void onDraw(SkCanvas* canvas) override {
52        SkPaint paint;
53        SkRect r;
54        r.setWH(600, 50);
55        paint.setShader(make_shader(r));
56
57        const struct {
58            InstallPaint    fProc;
59            uint32_t        fData0, fData1;
60        } rec[] = {
61            { install_nothing, 0, 0 },
62            { install_lighting, 0xFF0000, 0 },
63            { install_lighting, 0x00FF00, 0 },
64            { install_lighting, 0x0000FF, 0 },
65            { install_lighting, 0x000000, 0xFF0000 },
66            { install_lighting, 0x000000, 0x00FF00 },
67            { install_lighting, 0x000000, 0x0000FF },
68        };
69
70        canvas->translate(10, 10);
71        for (size_t i = 0; i < SK_ARRAY_COUNT(rec); ++i) {
72            rec[i].fProc(&paint, rec[i].fData0, rec[i].fData1);
73            canvas->drawRect(r, paint);
74            canvas->translate(0, r.height() + 10);
75        }
76    }
77
78private:
79    SkString fName;
80    typedef GM INHERITED;
81};
82
83
84//////////////////////////////////////////////////////////////////////////////
85
86DEF_GM(return new ColorFiltersGM;)
87